Use server core dumping instead of process freeze in gdb

[Deantwo]

Duplicate of https://www.hazeron.com/mybb/showthread.php?tid=2204.

Even a selective 10 minute rollback wouldn't save the servers if the issue causing the crash is: the completion of a >10 minute manufacturing process, asteroid impacting a world, player clicking a commonly used button, or similar.

This has been discussed a lot, and there really isn't any good solution that couldn't horribly backfire.